Hisert Balaclava Silverplus Thermoactive Protection HR 13 92% Polyester, 8% Elastane Imported Silver Plus technology sizes: XS / S Head circumference: 19, 20in; M / L Head circumference: 21, 22in; XL / XXL Head circumference: 23, 24in; Head circumference measured above the eyebrows. Washable at a 104  F